CVE-2017-0371Public exploitNetwork attack vector

Visitor IP disclosure via CSS sanitizer bypass

Published Feb 18, 2022 · Updated Aug 5, 2024

Information disclosure in MediaWiki before 1.23.16, 1.24.0 through 1.27.1, and 1.28.0 allows remote attackers to obtain visitor IP addresses. The inline CSS sanitizer blocks url() but fails to reject attr() with the url type, so a title attribute can supply an attacker-controlled background-image URL. A visitor must render attacker-authored wiki content in a browser that implements typed CSS attr(); the resulting request exposes the visitor's source IP without granting data modification or service interruption.

CVSS severity7.5
High
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in MediaWiki before 1.23.16, 1.24.0 through 1.27.1, and 1.28.0 allows remote attackers to obtain visitor IP addresses. The inline CSS sanitizer blocks url() but fails to reject attr() with the url type, so a title attribute can supply an attacker-controlled background-image URL. A visitor must render attacker-authored wiki content in a browser that implements typed CSS attr(); the resulting request exposes the visitor's source IP without granting data modification or service interruption.

The record

CVE
CVE-2017-0371
Published
Feb 18, 2022
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1590.005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1590.005Gather Victim Network Information: IP Addresses

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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